I have this small metal slinky like the pic and it is the best fidgit toy probably every. I be spinnin this shit between my fingers so often. it doesn't have to be used like a slinky at all, you can just sling it around. I genuinely love this slinky so much that I when I was recently away from home I kept reaching across my desk to where my slinky would be without thinking about it and then getting dissapointed when my slinky was not there. get a slinky comrades, they slap.
size is important here though, as is material. There are many plastic slinkies and they suck, get metal. Slinkies also come in a variety of sizes and which one you want depends on your use case. if you want a fidgit toy like I am recommending then you should get something that is abuot an inch in diameter.
Warning: metal slinkies have a smell and if you don't want your hands to smell like metal then get plastic.
Tankies and slinkies share most of their letters. Coincidence? I don't think so!